Electric heater.



Patented Nov. 28, I899.

E. E. GOLD.

ELECTRIC HEATER.

(Application filed Feb. 18, 1898.)

(No Model.)

INVENTOR: m g @9604,

By his Aflorneys.

WITNESSES:

UNITED STATES ATENF @FFICE.

EDVARD E. GOLD, OF NETV YORK, N. Y.

ELECTRIC HEATER.

SPECIFICATION forming part of Letters Patent No. 638,050, dated November28, 1899.

Application filed February 18,1898. Serial No. 670,724. (No model.)

To all whom it may concern.-

Be it known that I, EDWARD E. GOLD, a citizen of the United States,residing in the city, county, and State of New York, have inventedcertain new and useful Improvements in Electric Heaters, of which thefollowing is a specification.

This invention provides certain improvements relating to electricheaters of that class wherein the heat is generated by passing anelectric current through a coil-or helix of resistant wire which isexposed to the air, by the circulation of which the generated heat isconducted away from the wire. The present invention relates chiefly tothe means for supporting and inclosing such a heater and the terminalconnections thereof.

In the accompanying drawings, Figure 1 is a sectional elevation of aheater constructed according to my invention, being partly dissected toshow the construction in detail. Fig. 2 is a vertical transversemid-section thereof. Fig. 3 is an elevation of one of the insulating endplates or heads. Fig. i is a transverse section of a modification.

In the drawings let A designate a helix of resistant wire, and let Bdesignate a support therefor of insulating material. For the support B,I prefer to employ a wire or rod coiled into an open heliX, with itsends being bent into line with its axis and the wire coated withvitreous enamel or other insulating material adapted to resist the heat.The resistant wire A may be coiled helical] y around thesupporting-wirew B in an open helix, as shown. The opposite ends of thesupport B are upheld by heads 0 0, preferably of porcelain.

When it is desired to inclose the heater, a perforated or open-workcasing D is provided, made, preferably, of perforated sheet metal, asshown, and extending between the heads 0 O, which latter enter at 0within the opposite ends of the casing, so as to center it and hold thehelices centrally within it. The end portions 1) of the supporting-wireB are preferably naked and screw-threaded, and nuts fare screwed uponthem, so that by tightening these nuts the heads 0 are held in firmcontact with the ends of the casing D. hen no casing is desired, theconstruction shown in Fig. 4 may be adopted, any suitable number oflongitudinal rods or bars E E being extended between the opposite endplates or heads 0 C to hold them at fixed distances apart.

The opposite ends of the resistant wire A are connected to binding-postsF F, which pass through the porcelain heads 0, being clamped firmlythereto by means of a nut g and by means of another nut h fasteningthereto the circuit wires or leads 2' i. I form each of the porcelainheads C with a recessj in its outer side, as shown in dotted lines inFig. 3, in which recess the nuts fg 7L are located. I prefer to carrythe wirest'out through holes or notches 7a, communicating with therecessesj. To close these chambers j and inclose and protect thebinding-posts and avoid all possibility of accidental contact therewith,I place a cap-plate G over each end of the heater, with an interveningplate Z of asbestos or other insulating material, these being clampedagainst the heads C in any suitable manner, preferably by means of ascrew m, passing through the head and screwing into a nut 29, which ishoused in a recess q, Fig. 3, in the head, whereby the screw and plate Gare insulated. To get access to the bindingpost, it is only necessary toloosen the screw m, which is preferably placed close to the upper sideof the head, so that the plate G is thus fastened eccentrically, andthen to swing the plate G upward, thereby uncovering the chamber 3'.

To prevent the cap-plate G being turned accidentally on its screw m, soas to displace it, I provide it with a projection r, as shown in Figs. 1and 2, which enters into a recess or depression 3 in the earthenwarehead 0. Hence in order to swing the cap G to one side, so as to exposethe chamberj, it is only nec essary to slacken the screw at sufficientlyto permit the projection r to escape from the recess s.

\Vhen the casing D isused, some means should be provided for preventingturning of the heads 0 O relatively to the casing, and to thisend I formthe projecting boss 0 on each of the heads 0, which enters within thecasing, with an indentation c at any suitable point, Fig. 3, and indentthe metal of the easing into it at both ends, as shown at c in Figs. 1and 2, which may be done by turning in an earof metal, as indicated, orby crimping the metal in.

So far as concerns my present invention, the particular construction ofresistant wire A and support B is immaterial. They may be of theconstruction shown and claimed in my application, Serial No. 666,024,filed January 8, 1898.

I claim as my invention the following-defined novel features,substantially as hereinbefore specified, namely:

1. In an electric heater, the combination with a resistant wire and awire or rod forming a support therefor, of opposite end heads 0 0connected together, each head formed with a recess j in its outer side,the ends of said supporting-wire passing through the heads into saidrecesses, fastening-nuts applied on the ends of said Wire in saidrecesses, binding-posts mounted in said recesses for connecting theexternal circuit-Wires to the terminals of the resistant Wire, andcap-plates G covering said recesses.

2. In an electric heater, the combination with a resistant wire and awire or rod forming a support therefor, of opposite end heads 0 0connected together, said heads formed with recesses in their outersides, the ends of said supporting-Wire passing through the heads intosaid recesses, fastening-nuts applied on the ends of said wire in saidrecesses, binding-posts passing through said heads, connecting on theinner sides of the heads with the terminals of said resistant wire, andon the outersides projecting into said recesses and there provided withnuts for clamping the external circuit-wires, cap-plates G covering saidrecesses, and a fastening-screw for each cap-plate.

3. In an electric heater, the combination with a resistant Wire and awire or rod forming a support therefor, of opposite end heads 0 0connected together, each head formed with a recess j in its outer side,the ends of said supporting-wire passing through the heads into saidrecesses, fastening-nuts applied on the ends of said wire in saidrecesses, binding-posts mounted in said recesses for connecting theexternal circuit-Wires to the terminals of the resistant Wire,cap-plates G covering said recesses, a fastening-screw for eachcap-plate located eccentrically near one side so that by loosening saidscrew the plate can be turned to expose said recess, and means fornormally preventing displacement of the cap-plate relatively to thehead, consisting of a projection upon the one entering a recess in theother.

4. In an electric heater, the combination with insulating-heads C C, ofintervening tubular casing D, and means for drawing the heads togetheragainst the casing, the heads formed with bosses c entering the ends ofthe casing, these bosses having recesses 0 and the metal casing indentedat 0 into these recesses to prevent rotative displacement of the headsrelatively to the casing.

In witness whereof I have hereunto signed my name in the presence of twosubscribing witnesses.

EDWARD E. GOLD. Witnesses:

ARTHUR O. Fnnsnn, GEORGE H. FRASER.

